Atomic Number of Astatine

Astatine Atomic Number

Atomic Number of Astatine is 85.

Chemical symbol for Astatine is At. Number of protons in Astatine is 85. Atomic weight of Astatine is 210 u or g/mol. Melting point of Astatine is 302 °C and its the boiling point is 337 °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

About Astatine

Astatine is a chemical element discovered closer to the middle of the last century by a group of Californian scientists. It is a very unstable and dangerous radioactive element which has got its name after the Greek word meaning unstable. Due to its high toxicity astatine is considered to be really dangerous to human life. It can be obtained in very small amounts in labs and, due to very high instability of this element, it is not easy to maintain it in its stable form. It has no industrial or commercial applications and is used only for research.

Properties of Astatine Element

Atomic Number (Z)85
Atomic SymbolAt
Atomic Weight210 u
Density7 g/cm3
Melting Point (K)575 K
Melting Point (℃)302 °C
Boiling Point (K)610 K
Boiling Point (℃)337 °C
Heat Capacity
Abundance3×10−20 mg/kg
State at STPSolid
Electronegativity (Pauling) χ2.2
Ionization Energy (eV)
Atomic Radiusno datapm
Covalent Radiusno datapm
Valence Electrons7
Year of Discovery1940
DiscovererCorson and MacKenzie

What is the Boiling Point of Astatine?

Astatine boiling point is 337 °C. Boiling point of Astatine in Kelvin is 610 K.

What is the Melting Point of Astatine?

Astatine melting point is 302 °C. Melting point of Astatine in Kelvin is 575 K.

How Abundant is Astatine?

Abundant value of Astatine is 3×10−20 mg/kg.

What is the State of Astatine at Standard Temperature and Pressure (STP)?

State of Astatine is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Astatine Discovered?

Astatine was discovered in 1940.